US4165299A
Expired / Lapsed
US
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Preparation of a single phase vanadium (IV) bis (metaphosphate) oxidation catalyst with an improved surface area
Assignee: Atlantic Richfield Co
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Filing: 1978-05-23
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Granted: 1979-08-21
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Expires: 1998-05-23
Abstract
Abstract A method for the preparation of a single phase vanadium(IV)bis(metaphosphate), VO(PO3)2, catalyst having an improved surface area and useful for the vapor phase oxidation of linear C4 unsaturated olefins, such as the n-butenes, to prepare maleic anhydride.
Inventors
- 👤 S. Erik Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:41
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A method for the preparation of a single phase vanadium(IV)bis(metaphosphate) oxidation catalyst for preparing maleic anhydride by oxidation of unsaturated aliphatic hydrocarbons, which catalyst has an intrinsic surface area of from about 1.5 to 5.0 m 2 /gm., which comprises the steps of: forming a solid state mixture of vanadyl sulfate and phosphorus pentoxide; introducing said mixture into a heating zone and maintaining said zone and mixture at a temperature of at least about 325° C. for a period sufficient for the liberation of gases and forming a vanadium phosphorus reaction product; cooling the reaction product and washing with water to essentially remove any soluble residue; drying the water washed product and calcining in air to obtain a single phase vanadium(IV)bis(metaphosphate) catalyst having an intrinsic surface area of from about 1.5 to 5.0 m 2 /gm.
Claim 2
Independent Claim
136 words
A method for the preparation of a single phase vanadium(IV)bis(metaphosphate) oxidation catalyst for preparing maleic anhydride by oxidation of unsaturated aliphatic hydrocarbons, which catalyst has an intrinsic surface area of from about 1.5 to 5.0 m 2 /gm., which comprises the steps of: forming a solid state mixture of vanadyl sulfate and phosphorus pentoxide; introducing said mixture into a heating zone and maintaining said zone and mixture at a temperature of at least about 325° C. for a period sufficient for the liberation of gases and forming a vanadium phosphorus reaction product; cooling the reaction product and washing with water to essentially remove any soluble residue; drying the water washed product and calcining in air to obtain a single phase vanadium(IV)bis(metaphosphate) catalyst having an intrinsic surface area of from about 1.5 to 5.0 m 2 /gm.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein at least stoichiometric amounts of vanadyl sulfate and phosphorus pentoxide are employed to form the solid state mixture.
Claim 4
Dependent Claim
28 words
A method according to claim 1 wherein the mixture of vanadyl sulfate and phosphorus pentoxide is reacted at a temperature of between about 400° C. and 460° C.
Claim 5
Dependent Claim
31 words
A method according to claim 1 wherein the reaction mixture is dried at a temperature of about 120° C. and calcined in air at a temperature of at least 450° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |